Over the years, Von Duprin has been an innovator in many new concepts to the industry. These include the latch track threshold, drop forged center case, concealed vertical rod device, reversible exit device, narrow stile device, extruded aluminum mullion and wood door concealed device, all designed to meet the needs of architects and building owners. The most innovative change took place in 1972, when the company introduced the first pushpad exit device, the 33 Series. One benefit of the new pushpad design was its ability to be electrified. Shortly after the 33 Series was introduced, the EL electric latch retraction version exit device was developed.